Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.6. 887. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED MAY 19, 1970 T874,008 SUPERSENSITIZED SILVER HALIDE PHOTOGRAPHIC EMULSIONS Cynthia G. Ulbing, Fairport, and Mary Jane W. Brizee, fitssford, N.Y. (both of Kodak Park, Rochester, N.Y.

) Filed Dec. 12, 1969, Ser. No. 884,701

Int. Cl. G03c 1/28 U.S. Cl. 96-104 No Drawing. 18 Pages Specification Photographic silver halide emulsions are spectrally sensitized with a dye combination comprising (1) a benzimidazolocarbocyanine dye and (2) a benzimidazoloselenacarbocyanine dye. A preferred dye combination comprises (l) a benzimidazolocarbocyanine dye having the wherein n, m, k and p each represents a positive integer of from 1 to 2; L L and L each represents a methine linkage; R R R and R each represents an alkyl group; R R and R each represents an unsubstituted lower alkyl p; 8, 9, 10 11 12 13 14 and 15 each represents a member selected from the group consisting of a hydrogen atom and a. halogen atom; X and X each represents an acid anion; V represents a member selected from the group consisting of .a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group and an aryl group; and W, Y and Z each represents a member selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, an alkyl group, an alkoxy group, an acyl group of a monobasic fatty acid, an alkylaminocarbonyl group, a trifiuoroalkyl group and a trifluoroalkylsulfonyl group. A typical example comprises a gelatin silver bromOiOdide emulsion containing the dye combination of 1 anhydro-5,5',6,6-tetrach10ro-1,1-diethyl-3,3-di(3-sulfobutyl)benzimidazolocarbocyanine hydroxide and (2) anhydro 5,6-dichloro-1,3-diethyl-5-methoXy-3'-(3-sulfopropyl)benzimidazoloselenacarbocyanine hydroxide. 

